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| author | William Breathitt Gray <william.gray@linaro.org> | 2022-09-27 18:53:39 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-30 14:32:35 +0200 |
| commit | 9830288aeada5ec8ded1665aafe2d2b8f4121bad (patch) | |
| tree | 1c26da98af12acb36b5d2766a4c5e4b9c053729f /drivers/counter | |
| parent | 650ae67bbf7ba5ac193f053969612fbb93247b64 (diff) | |
| download | lwn-9830288aeada5ec8ded1665aafe2d2b8f4121bad.tar.gz lwn-9830288aeada5ec8ded1665aafe2d2b8f4121bad.zip | |
counter: 104-quad-8: Add Signal polarity component
The 104-quad-8 driver provides support for Index signal polarity modes
via the "index_polarity" Signal component. This patch exposes the same
functionality through the more standard "polarity" Signal component.
Link: https://lore.kernel.org/r/01d00c21873159833035cb6775d0d0e8ad55f2ef.1664204990.git.william.gray@linaro.org/
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/0bf840beee1665e9f04ea82368ecdde87c791a22.1664318353.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/counter')
| -rw-r--r-- | drivers/counter/104-quad-8.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 1323edfbe40c..2a9d8259ed4b 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -549,6 +549,32 @@ static int quad8_index_polarity_set(struct counter_device *counter, return 0; } +static int quad8_polarity_read(struct counter_device *counter, + struct counter_signal *signal, + enum counter_signal_polarity *polarity) +{ + int err; + u32 index_polarity; + + err = quad8_index_polarity_get(counter, signal, &index_polarity); + if (err) + return err; + + *polarity = (index_polarity) ? COUNTER_SIGNAL_POLARITY_POSITIVE : + COUNTER_SIGNAL_POLARITY_NEGATIVE; + + return 0; +} + +static int quad8_polarity_write(struct counter_device *counter, + struct counter_signal *signal, + enum counter_signal_polarity polarity) +{ + const u32 pol = (polarity == COUNTER_SIGNAL_POLARITY_POSITIVE) ? 1 : 0; + + return quad8_index_polarity_set(counter, signal, pol); +} + static const char *const quad8_synchronous_modes[] = { "non-synchronous", "synchronous" @@ -977,6 +1003,13 @@ static struct counter_comp quad8_signal_ext[] = { quad8_signal_fck_prescaler_write) }; +static const enum counter_signal_polarity quad8_polarities[] = { + COUNTER_SIGNAL_POLARITY_POSITIVE, + COUNTER_SIGNAL_POLARITY_NEGATIVE, +}; + +static DEFINE_COUNTER_AVAILABLE(quad8_polarity_available, quad8_polarities); + static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes); static DEFINE_COUNTER_ENUM(quad8_synch_mode_enum, quad8_synchronous_modes); @@ -984,6 +1017,8 @@ static struct counter_comp quad8_index_ext[] = { COUNTER_COMP_SIGNAL_ENUM("index_polarity", quad8_index_polarity_get, quad8_index_polarity_set, quad8_index_pol_enum), + COUNTER_COMP_POLARITY(quad8_polarity_read, quad8_polarity_write, + quad8_polarity_available), COUNTER_COMP_SIGNAL_ENUM("synchronous_mode", quad8_synchronous_mode_get, quad8_synchronous_mode_set, quad8_synch_mode_enum), |